Stairs and method of making the same
US4154032A · kind A · utility
Inventor
Key dates
| Filing date | Feb 2, 1978 |
| Grant date | May 15, 1979 |
| Priority date | — |
| Expiry date | Feb 2, 1998 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE04F11/025
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A construction for wooden stairs that provides for rapid layout and assembly of the stairs by using an interlocking technique that locks the treads and risers into the stringers without the use of fasteners, adhesives or wedges. The construction technique and the resulting unique stairs substantially reduces the layout and assembly time from that required by conventional stairs by accurately machining the required dovetail grooves in the stringers and the corresponding male dovetail on each tread and riser end. Each tread and riser are then slid into place in the stringers and are interlocked so that once the stairs are assembled and interlocked, it is impossible for the components to become separated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.